Thanks Graham, but the early +8s aren't quite like that. The fuse for the horns and radiator fan (through a relay) is fed from the ammeter. Two other fuses are fed from the ignition switch, and the fourth between the lighting switch and the connected lights and spotlights. The pre-engaged starter solenoid (mounted on the starter) has the battery +ve connected directly to it and also 4 other brown wires going round the car. So a single power fuse will not work without a major rewire.
Arwyn - yes, four glass fuses and two spares, but I doubt all all 25 A.
I think the point that Graham made earlier was that any brown wires (in his photo just 2 but in your case 4) emanating from the starter solenoid need to be protected by a suitable fuse before they reach their own respective fuses. If those brown wires should short to earth the battery will feed an enormous quantity of energy in prior to exploding or the wires burning out!
